Hello list, WHAT / WHY ---------- I am running FreeRADIUS 3.2.7 (official docker image) behind an AWS Network Load Balancer. The NLB performs a TCP health-check against the "status" virtual-server on port 8000 every 10 seconds. After ±16 probes the server starts logging: Failed inserting TCP socket into parent list. Ignoring new connection due to client max_connections (16) Health checks continue to be successful (because they are just TCP, I assume). SET-UP ------ Can be reproduced on following Dockerfile: FROM freeradius/freeradius-server:3.2.7 RUN cp /etc/freeradius/sites-available/aws-nlb /etc/freeradius/sites-enabled/aws-nlb RUN sed -i 's/192\.0\.2\.1/*/' /etc/freeradius/sites-enabled/aws-nlb EXPOSE 8000/tcp CMD ["-f", "-X"] The only change is wildcard IP on healthcheck server. All other configuration is untouched vanilla 3.2.7. DEBUG LOGS ------ … [initialisation omitted – identical to stock container, including last 2 probes output] … 20:23:49+03:00 Ready to process requests 20:23:50+03:00 ... new connection request on TCP socket 20:23:50+03:00 Failed inserting TCP socket into parent list. <--- THIS ONE 20:23:50+03:00 Listening on status from client (10.88.0.20, 41252) -> (*, 8000, virtual-server=aws-nlb) 20:23:50+03:00 Waking up in 0.8 seconds. 20:23:50+03:00 Client has closed connection 20:23:50+03:00 ... shutting down socket status from client (10.88.0.20, 41252) -> (*, 8000, virtual-server=aws-nlb) 20:23:50+03:00 Ready to process requests 20:23:51+03:00 ... new connection request on TCP socket 20:23:51+03:00 Failed inserting TCP socket into parent list. 20:23:51+03:00 Listening on status from client (10.88.0.20, 41254) -> (*, 8000, virtual-server=aws-nlb) 20:23:51+03:00 Waking up in 0.7 seconds. 20:23:51+03:00 Client has closed connection 20:23:51+03:00 ... shutting down socket status from client (10.88.0.20, 41254) -> (*, 8000, virtual-server=aws-nlb) 20:23:51+03:00 Ready to process requests 20:23:52+03:00 ... new connection request on TCP socket 20:23:52+03:00 Ignoring new connection due to client max_connections (16) <--- AND THIS ONE 20:23:52+03:00 Ready to process requests 20:23:53+03:00 ... new connection request on TCP socket 20:23:53+03:00 Ignoring new connection due to client max_connections (16) 20:23:53+03:00 Ready to process requests QUESTIONS --------- How harmful is this? And I doing something wrong? Can this be fixed? Thanks in advance for any insight. Happy to provide an untrimmed **radiusd -X** log or additional details if required. Best regards, — Pavels